Three UCM users are connected on a conference call by using Cisco IP phones. The switch port to which one of the users is connected fails.
Which of the following will occur?
- The other two users will remain on the call.
- The other two users will also be disconnected.
- All three users will remain active on the call.
- The disconnected user will be processed by another server in the cluster.
The other two users will remain on the call if the switch port to which one of the users is connected fails because Cisco IP phones are supported by the Cisco Unified Communications Manager (UCM) call preservation feature. The call preservation feature enables some Voice over IP (VoIP) devices to continue active sessions even if UCM fails or communication between UCM and the device is interrupted.
When a UCM server fails, other UCM servers and supported devices in a cluster can detect the failure. UCM is then able to ensure that active calls remain active until either the users hang up or media stops streaming between the devices. Similarly, if UCM does not fail but loses connectivity to a device that is involved in an active call, both UCM servers and connected devices will detect the failure. The active call will remain active until the users end the call or media stops streaming between the devices.
When a supported device other than UCM fails, that device will no longer stream media. Thus the device is no longer able to participate in its active call. However, UCM will detect this failure and any other devices that might have been active on the same call will remain connected and active.